as of unnaturalness between the child
and the parent; death, dearth, dissolutions of
ancient amities; divisions in state, menaces and
maledictions against king and nobles; needless
diffidences, banishment of friends, dissipation
of cohorts, nuptial breaches, and I know not what.

Although the example sentence was from Edmund repeating a general prediction of the state of the world, it can be seen as an overview of all the conflicts in the play. The word "malediction" is buried in the sentence but it is a good word to know because in this act, Lear both withholds a benison from Cordelia and gives a malediction to Goneril. Note the difference in Lear's power in the scenes.

as of unnaturalness between the child
and the parent; death, dearth, dissolutions of
ancient amities; divisions in state, menaces and
maledictions against king and nobles; needless
diffidences, banishment of friends,
dissipation of cohorts, nuptial breaches, and I know not what.

Another definition of "dissipation" is "dissolute indulgence in sexual pleasure"--this could also fit because it could lead to "nuptial breaches" but the rest of the sentence lists other examples of breaking up and scattering.

as of unnaturalness between the child
and the parent; death, dearth, dissolutions of
ancient amities; divisions in state, menaces and
maledictions against king and nobles; needless
diffidences, banishment of friends, dissipation
of cohorts, nuptial
breaches, and I know not what.

My lord, I know not what the matter is; but, to my
judgment, your highness is not entertained with that
ceremonious affection as you were
wont;

In the example sentence, "wont" is used as an adjective to refer to how Lear is used to being treated. Don't stick an apostrophe in the word because then it becomes a matter of what Lear will or won't do.

A look is not a physical blow, but because Lear is not used to receiving insulting looks, he feels as if he had been hit. So Lear hits Oswald in return, but as a servant, Oswald can't actually bandy with Lear.